LT1244M 데이터 시트보기 (PDF) - Linear Technology
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LT1244M Datasheet PDF : 16 Pages
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TYPICAL APPLICATI S
External Clock Synchronization
EXTERNAL
SYNC
INPUT
0.01µF
+
VREF
8
RT
RT/CT
4
CT
5V REF
OSCILLATOR
47Ω
D1
D1 IS REQUIRED IF THE SYNC AMPLITUDE IS LARGE
ENOUGH TO PULL THE BOTTOM OF CT MORE THAN
300mV BELOW GROUND.
LT1241 • TA01
VREF
8
R COMP
1
C
FB
2
–
+
2.5V
ISENSE
3
LT1241 Series
Soft Start
5V REF
5.6V
1V
1mA
2R
–
R
+
+
1.5V
–
LT1241 • TA02
Adjustable Clamp Level with Soft Start
VREF
8
RT/CT
4
R2 100k COMP
1
FB
2
–
C R1
+
2.5V
( VCLAMP ≈
1.67
R2
R1
+1
5V REF
MAIN BIAS
OSCILLATOR
5.6V
1mA
2R
1V
–
R
+
REFERENCE ENABLE
REFERENCE PULL-DOWN
UV
LOCKOUT
OUTPUT
PULL-DOWN
T
S
R
18V
BLANKING
+
1.5V
–
VCC
7
OUTPUT
6
GND
5
ISENSE
3
VIN
RS
IPK (MAX) ≈
VCLAMP
RS
WHERE: 0V ≤ VCLAMP ≤ 1.0V
tSOFT START = – ln 1 –
VC
3 • VCLAMP
C
R1 R2
R1 + R2
LT1241 • TA03
11
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